Bosch Thermotechnology Corp. upgraded its SM Series, two-stage geothermal water source heat pump. Bosch redesigned its SM vertical and counterflow cabinets with an increased focus on serviceability and reliability, with front water connections and an all-aluminum air coil to resist formicary corrosion. Bosch says it also redesigned the internal layout for easier access through the front panel to components most often requiring service or adjustment.

The newest models of the SM Series come in cooling capacities ranging from 2- to 5-ton packaged vertical, counterflow, and horizontal units. The company says each Greensource unit is recognized as Energy Star Most Efficient, with best-in-class performance, Energy Efficiency Ratings (EER) of up to 37.0 (part load) and 28.0 EER (full load), and Coefficient of Performance (COP) of up to 5.8 (part-load) and 5.5 (full-load) GWHP.